In Brief

A Curaçao businessman offers his submersible—the "Curasub"—to Smithsonian Institution researchers to study the ocean’s twilight zone, between 200 and 1000 meters. And a graduate student takes tweeting from a meeting to the next level—instead of just 140 characters, he tweets his hand-drawn caricatures of the speakers

About The Cover

COVER A woman carries her son as she begs for money at a red light in Shanghai, China. Researchers are struggling to understand the causes and consequences of a rapid rise in inequality in many countries. See page 818.
Photo: REUTERS/Carlos Barria